Game On! is a throwback text-based adventure built to help you explore microservices concepts.
The difference, however, is that your shiny new service is registered as a part of a larger system right out of the gate. The APIs that your service implements will be called by elements of the long-running composed application. You can then choose your own adventure: making services resilient, figuring out how load-balancing and scaling work, dealing with eventual consistency, etc.